In article <c588c5eeec224162bffd080693c70...@bayviewphysicians.com> you write: > The problem: > Spammers use non-existent domains to achieve identity spoofing, such as >tax.example.gov.uk > This is primarily a reception problem, because many recipient mail filters >are not equipped to block this type of fraud. ..
Right, and we can stop right there. A decent spam filter will treat a nonexistent From: domain or envelope bounce address as extremely suspicious and send the message into spam folder purgatory. If someone's filters aren't doing that, it is unlikely that they're paying much if any attention to DMARC, and no amount of fiddling with DMARC will make any difference. My mail server rejects anything with a non-existent bounce address at SMTP time and I don't think it's ever rejected anything my users would want. The solution to this problem is for mail systems to fix their filters, not to invent yet another mail-breaking hack that they won't use anyway. R's, John _______________________________________________ dmarc mailing list dmarc@ietf.org https://www.ietf.org/mailman/listinfo/dmarc
